Dark-room lamp



J. P. HANSEN.

DARK ROOM LAMP.

APPLICATION FILED FEB. 6. I9I9.

1,335,684. Patented Mar.30,1920.

A Zorneys J. P. HANSEN.

l DARK ROOM LAMP. APPLICATION FILED FEB. 6. 1919.

1,385,684, Patented Mar. 30, 1920.

2 SHEETS-SHEET 2- HUM/VNS JENS ETER HANSEN, OF COPENHAGEN, DENMARK.

DARK-ROOM LAMP.

Specification of Letters Patent.

Patented' Mar. 3o, ieee.

Application filed February 6. 1919. Serial No. 275,441.

To all whom. it 'may concern.:

it known that I. JnNs Pn'rnr. HANSEN, residing at lo. 10 glacobys Alle,Copenhagen. enmark, have invented certain new andl useful improvementsin Dark-Room i'iamps, of which the following is a specification.

The present invention concerns a dark room lamp, which also can be usedas printing and retouching apparatus for photographic use.

Y The outstanding feature of the invention is partly, that the lightrays are obliged to pass the colored glass or glasses before theypassthe reflector, and partly, that the lamp, which gives an indirectlight, very easily can be adjusted from giving light of vone (olor togive light of another color, and that the colors can be mixed at will. The lamp can also be used for the printing of ight and bromid paper andthe like,` and for retouching of negatives and positives.

rThe invention is shown in a single form of execution, on the drawing,where:

"Figure 1 is a side view of the lamp.

Fig. 2 is a top view of same, the cover being removed, and Fig. 3 is avertical longitudinal section on the line llllll (Fig. 2)

i is a side view partly in section of a modification;

Fig. 5 is a perspective view of another modification.

On the drawing 1 is a square or round box or chamber with removablecover '2. On the front of the bor; is a large opening 3, which may becovered by a pane, within which opening is applied a reflector il, whichmay be curved.

in the upper part of the box is a horizontal s-reen of which the middlethird part is cut out and covered by a pane of white, ground or milkglass. Below this pane is a groove 18, in which a pane of'another colorcan be slidingly inserted. Above the screen 5 two slides, 7 and 8properly guided can be displaced, of which one can contain red glass andthe other yellow glass, marked 9 and 1() respectively.

The two frames are connected by arms 11 and 12 applied in pairs to thetwo shafts 13 and 14 turnably fitted in the upper part of the box, whichshafts on the outside are provided with finger grips 15 and 16. Finallya light source 17 is applied above the screen 5.

ri`he lamp acts as follows:

Then the two slides 7 and 8, by means of the arms 11 and 12 and theshafts 13 and la have been displaced, so that they take'up the positionshown on FigsQ and 3, the light from thelight source 17 will pass thered in the frame 7 and the milk glassA (3 and reach the reflector 1,from which it will be reflected into the chamber.

By turning the shaft 13 against the hands of a clock the slide 7 will bedisplaced to the right,.li`ig. 3, and the rays will now only pass themilkglass.

Then the slide 8 is displaced to the right the light will be made topass the yellow glass 10.

If, for instance, the shaft 14 is turned, when the slides 7 and 8 are inthe position shown in Fig. 3, both slides will at the same time bedisplaced to the right, it being thus possible to change fronrred lightto yellow light, 'without getting white light between the two colors,likewise red can of course, be changed directly to yellow.

By an overlap on one or both of the glasses 9 and 10 at the place wherethey meet, and where the glasses otherwise only with ditliculty could bemade to join perfectly tightly by their edges, light-tightness can besecured so that white rays are avoided.

By placing the two glasses 9 and 10 beside each other above the opening19 in the screen 5 the mixed colors will be produced, the different raysbeing dispersed and mixed by the pane G and the reflector 4E.

lllhen the lamp is used for printing gaslight or bromid paper or thelike, the light sensitive material is placed in an ordinary }nintingframe while the lamp shows a light, which does not influence thematerial in question. rFhereafter the printing frame is held before theopening 3, and the light is changed to white. lllflhen the exposure isfinished, the light is changed to a relatively inactive color, whereuponthe print is removed.

The invention can also be used for a printing apparatus, and thereflector can then be removes, and the printing frame placed in suchmanner, that it is directly exposed to the rays of light. Finally, theapparatus can be used for retouching, a retouching frame 2() beingapplied by suitable means to the box 13 before or instead of the pane 3,as

shown in- Fig. 5, the white light will then form a very good and steadybackground for the negative.

The apparatus can be used standing, slanting, turnable or in lyingposition according to its purpose, the details being changedunessentially and accordingly. p

It should be mentioned that it is not necessary to use two slides, asingle slide being enough under certain circumstances, so that white canbe changed to another, single color. Y

Neither is it necessary, that the slides should be placed and displacedas shown on the drawing, it being possible to apply and move the slidesin other ways without devi ating from the principle of the invention.

In the lorm of execution shown here the frames 7 and 8 consist of clam sfastened in a springy way around the short edges oi2 the glasses. In theclamps are holes for the arms 11 and l2, which are springy and whichpress the clamps against the edges of the glass.

Instead of vthe clamps, the glasses 9 and lO may have holes for the armsl1 and 12.

The lamp may be placed on a small turntable 21 provided with a pivot 22,which cooperate with a hole in the bottom of the box l3 of the lamp asshown in F ig. 4.

lVhat I claim, and desire to secure by Letters Patent is:

1. A dark room lamp comprising a casing, a source of light in thecasing, an apertured screen in the casing below the light, a glass belowthe opening of the screen, two diil'erent colored glasses above thescreen and moable alternately over the opening of the screen, and areiector in the lower portion of the casing and adapted to direct lightthrough an opening in the casing. y,

2. A' dark room lamp, comprising a casing, a source of` light in thecasing, an apertured screen below the light, a glass below the screen,two slides above the screen and each carrying a different colored glass,means for operating the slides, and whereby they may be movedalternately over the opening of the screen, or the opening left exposedand a reflector in the lower portion of the casing and adapted to directlight through an opening in the casing.

3. A dark room lamp, comprising a casing, a source of light in thecasing, an aper` tured screen in the casing below the light, a glassbelow the. screen, two slides above the screen and each carrying adifferent colored glass, shafts having means for operating them andprovided with arms engaging the slides, and a reflector in the lowerportion of the casing and adapted to direct light through an opening inthe casing.

4. In a dark room lamp, a casing, Van apertured screen, slides above thescreen and each carrying a diiferent colored glass, the

slides being provided with openings, shaftsabove the slides, and springarms carried Vby the shafts and engaging the openings ofthe slides.

5. In a dark room lamp, an apertured casing, an apertured screen, aglass below the screen, two dierent colored glasses above the screen,means for moving the different colored glasses alternately over theopening of the screen, a source of light above the different coloredglasses, and a curved re- Hector in the lower portion of the casing.

6. In a dark room lamp, a casing having a panel in one side and providedwith an apertured transverse screen and different colored glasses abovethe screen and movable alternately over the aperture thereof, and meansfor detachably securing a plate frame over the panel of the casing.

In testimony whereof I aiiix my signature in presence of two witnesses.

JENS PETER HANSEN.

Vitnesses CHARLES HUDE, E, STAUN.

